^Acta Geologica Polonica, Volume 55, Pages 211-466. Museum Ziemi. 2005. p. 211. Devonian conodonts (Cryptotaxis sp.) are so far known only from the Frasnian - middle Famennian in the Solimoes Basin, northwestern Brazil (Hunicken & al. 1988).
Multielement Conodont Species from the Louisiana Limestone (Upper Devonian) of West-Central Illinois and Northeastern Missouri, U.S.A. Karl M. Chauffe and Patricia A. Nichols, Micropaleontology, Vol. 41, No. 2 (Summer, 1995), pages 171–186,
